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RE: [TowerTalk] unguyed heights for Rohn 65 etc.?

To: "'RICHARD BOYD'" <>, <>
Subject: RE: [TowerTalk] unguyed heights for Rohn 65 etc.?
From: "Joe Subich, K4IK" <>
Date: Thu, 13 Jan 2005 22:59:20 -0500
List-post: <>

> Anyone have an idea (or facts) how high I could go unguyed 
> with Rohn 65, assuming a single 48' boom monobander for 20, 
> or 15, or 10 (plus appropriate rotator, and I'll have the 
> yagi right above the tower, shortest mast possible within 
> reason)?  

The Rohn Commercial Catalog (11993) gives the following 
allowable antenna areas for Rohn 65 at 80 MPH (Prince Georges 
Co. is 75 MPH zone): 

Ht.      no ice    1/2" ice 

50'       19.7       19.1 
60'        9.4        4.1 

Note 3:  Designs assume two 7/8" lines on each tower face. 
         (nb: 7/8" line is .0875 sq. ft. per lineal foot)   

> Okay, let me toss out another possibility:  Rohn 80 (I know 
> it comes in various sub-models, some 40" face, some 44" face 
> and there may be other differences, but assume the basic or 
> the typical one).

No chart in my book for Rohn 80 free standing.  "Each tower 
is individually engineered to handle a particular job."

Rohn 80 is 41" center-to-center on the legs however the legs 
vary from 2" to 3" in standard (schedule 40?) and X-STR 
(schedule 80?).  Rohn 80 has both standard (zig-zag) and 
cross braced sections.   


   ... Joe, K4IK 


See:  for "Self Supporting Towers", "Wireless Weather 
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